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On my old 87 YJ 4 banger I gained 5% in Milage and a noticeable incress in power by installing the K&N filter in the orginal box, and the addition of a good flowing muffler and the loss of the cat. Not to mention the sound was much better. The K&N is not that over priced if you look at it from the stand point of you are able to clean it recharge it and run it some say 100,000 miles. Any time you alow more CFM's to enter your carb and more CFM's to leave through your exaust you are going to not gain more power but you will allow the power that is stiffled in your enging to present itself. I have used this befor but here goes again. Run around the block at a brisk pace. Rest and while you do think about what it took out of you to do so. Once rested Do it again only this time do it with a resparator, or Gasmask on restricting your air intake and exhalation. Compare this with the first trip around the block. Opening up the air ways will do the same for your engin. Just my 2 cents. tug
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